In bear free areas I use 6' tall welded wire cages that are about 5' in diameter until I can get the lowest scaffold around 5' or so. That's typically around year 4-6 for me. I actually have a couple B118 Franklins that are big enough to remove the big cages this fall at year 3. I remove the big cages as early as possible so then I have an excuse to put that cage in a different area the following year for a new planting.
Once the big cages are removed I put a 4' tall section of welded wire around the trunk to prevent buck rub damage. I just use a small piece for that to create a trunk cage maybe 8" in diameter. That will stay on indefinitely. I also use aluminum screen around the trunk both with the big cages and also when I have the smaller trunk cage on.